Messages in this thread |  | | Subject | Re: Big mallocs, mmap sorrows and double buffering. | Date | Wed, 12 Feb 1997 13:57:30 +0300 | From | Boris Tobotras <> |
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On Tue, 11 Feb 1997 16:10:39 +0100, Ingo Molnar wrote:
> > Hmm. I remember using a facility like this on the old vaxen. The > > glitch was if I mapped an entire satellite image (+-400megabytes) the > > page tables used up so much physical memory that the thing started > > thrashing again. (There we just settled down to using two 32k buffers > > and doing NO_WAIT read/writes.) > > 400M mmap()-ed file takes ~400K page tables (for every 4K page there is a > 4 byte descriptor). So this shouldnt be an issue even on low-end machines.
Can kernel use Pentium 4M pages, if process tries to map continuous large chunks of memory?
-- Best regards, -- Boris.
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